本文選題：波形板氣液分離器 + 湍流效應��； 參考：《華中科技大學》2014年碩士論文

【摘要】：氣液分離技術廣泛地應用于諸多能源、電力及工業(yè)領域。要想實現(xiàn)清潔能源利用、節(jié)能減排、能源高效利用等能源戰(zhàn)略核心，安全、經(jīng)濟、高效、穩(wěn)定的氣液分離技術是必然的選擇。 結(jié)構(gòu)緊湊、體積小、分離效率高是波形板氣液分離的優(yōu)點，因此，本文針對波形板氣液分離器進行了數(shù)值模擬研究與分析。波形板氣液分離器結(jié)構(gòu)復雜，，包含有汽、液兩相和三個流場(氣流相、液滴相、液膜相)。在微觀層面，對液滴相的特性、液滴的沉降、液滴的二次攜帶機理進行了全面的分析；在宏觀層面，通過數(shù)值模擬分析了考察液滴粒徑、汽流場的速度對波形板氣液分離器的分離性能的影響。 本文采用兩相三流場模型來分析兩相三流場的特性。運用Fluent6.3中的k湍流模型模擬出復雜結(jié)構(gòu)波形板內(nèi)氣流運動特征，在此基礎上，通過歐拉-拉格朗日多相流模型來模擬離散相在其流場中運動特征。離散相的湍動能與湍流效應的分析能更好地用來研究不同液滴直徑、氣流場速度下的分離效率。本文分別對三菱、西屋兩類波形進行了數(shù)值模擬分析，從分離效率和壓降這兩個關鍵因素對波形板的結(jié)構(gòu)形式進行數(shù)值分析，模擬結(jié)果發(fā)現(xiàn)不同結(jié)果形式的波形板對不同粒徑顆粒群的捕獲存在突變區(qū)間且不一樣，其中，三菱單鉤波形的區(qū)間值最小為4~7μ m。同時，引入Wall-film模型對所形成的板壁液膜進行了數(shù)值模擬和分析，考察了液膜對四種波形板壓降的影響。在大曲率的情況下，液膜破裂的數(shù)值分析得到了回旋汽流與主流場的共同作用是形成帶狀薄膜破裂是一個不可忽視的因素。以上內(nèi)容對今后波形板的實驗研究和結(jié)構(gòu)優(yōu)化具有指導性意義。
[Abstract]:Gas-liquid separation technology is widely used in many fields of energy, power and industry. In order to realize clean energy utilization, energy saving and emission reduction, energy efficient utilization and other energy strategic core, safe, economic, efficient and stable gas-liquid separation technology is the inevitable choice. Compact structure, small volume and high separation efficiency are the advantages of gas-liquid separation with corrugated plate. Therefore, the numerical simulation and analysis of the gas-liquid separator with corrugated plate are carried out in this paper. The structure of the gas-liquid separator is complex, which includes vapor, liquid two-phase and three flow fields (airflow phase, droplet phase, liquid-film phase). At the micro level, the characteristics of the droplet phase, the deposition of the droplet, the mechanism of the secondary carrying of the droplet are comprehensively analyzed, and at the macroscopic level, the particle size of the droplet is investigated by numerical simulation. The influence of the velocity of steam flow field on the separation performance of the gas-liquid separator with waveform plate. In this paper, the characteristics of two-phase and three-flow field are analyzed by using two-phase and three-flow field model. Based on the k turbulence model in Fluent 6.3, the characteristics of the flow in the complex structure are simulated. Based on this, the characteristics of the discrete phase in the flow field are simulated by Euler-Lagrangian multiphase flow model. The analysis of turbulent kinetic energy and turbulent effect of discrete phase can be used to study the separation efficiency of different droplet diameter and flow field velocity. In this paper, two kinds of waveforms, Mitsubishi and Westinghouse, are numerically simulated and analyzed respectively, and the structural form of the waveform plate is numerically analyzed from the two key factors of separation efficiency and pressure drop. The simulation results show that there is a catastrophe interval in the capture of different particle groups with different waveforms, and the minimum value of Mitsubishi single hook waveform is 4 ~ 7 渭 m. At the same time, the Wall-film model is introduced to simulate and analyze the liquid film, and the effect of the film on the pressure drop of four kinds of wavy plates is investigated. In the case of large curvature, the numerical analysis of liquid film rupture shows that the interaction between gyrosteam flow and mainstream field is a factor which can not be ignored. The above contents are instructive to the experimental research and structure optimization of the waveform board in the future.
【學位授予單位】：華中科技大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：TB657.7

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